REPORT ON THE AMPHIPODA. 1121 



not so long as the head, with some small slender spines about the distal end. The 

 remaining joints missing. Fig. a.i. should be a.s. 



Lower Antennae. — The first two joints short, the gland-cone decurrent, the third joint 

 not as long as the preceding two united, having three or four small groups of spines 

 about its distal end. The rest of the joints missing. Both figures a.s. should be a.i. 



Mandibles. — The cutting edge broad, with seven well-defined but unequal teeth on 

 each mandible ; the secondary plate on the left mandible with the broad distal edge 

 cut into five teeth ; on the right mandible this plate has two obvious teeth, with perhaps 

 two or three denticles in addition, and as usual does not easily lend itself to a broadside 

 view, except when seen through the transparent skin in preparation for the next moult ; 

 the spiues of the spine-row are six in number, slender, much bent, and the distal half 

 strongly denticulate especially on the front convex side ; on the right mandible the sixth 

 spine is diminutive ; the molar tubercle prominent, with long teeth encircling the crown, 

 aud a long plumose seta at one corner of it. The process near the base of the palp is 

 small ; the first joint of the palp a good deal longer than broad ; the second joint 

 about twice as long as the first, with a spinule near the apex ; the third about as long 

 and broad as the second, with five long spines on the broad apex. The right mandible 

 is figured on the left, and the left mandible on the right, in the Plate ; the large upper- 

 most tooth of the cutting edge has beside it a less prominent tooth not shown in the 

 figures. 



Lower Lip. — The principal lobes distally narrow, with the inner corner produced in 

 a little rounded point, the inner margin strongly sinuous, with cilia on the slightly 

 convex distal part and on the very convex lower part, which is near the strongly ciliated 

 distal margin of the inner lobes ; the mandibular processes are large, distally narrow 

 but not acute. 



First Maxillae. — The inner plate small, in one maxilla with two, in the other with 

 three, plumose setae on the inner margin ; the outer plate broad, with ten spines on the 

 broad truncate distal margin, the innermost with three lateral denticles, two of the 

 three next with a single lateral tooth on the outer side, some but not all of the others 

 having, as far as could be seen, two or three lateral teeth on the inner side ; the first 

 joint of the palp very short, the second widening from the base, curving, and reaching a 

 little beyond the outer plate, its apical margin with sloping sides cut into four teeth 

 and carrying five spine-teeth ; there are three slender spines on the surface at some 

 distance from the apical as well as from the outer and inner margins. 



Second Maxillae. — The inner plate nearly as long but not so broad as the outer, 

 with a series of thirteen setae passing from near the base of the inner margin in a curve 

 towards the outer apex ; the ajaical margin is narrow, with a group of close-set spines, 

 and a few descend the distal part of the inner margin at intervals ; the outer plate 

 has a straight inner margin, at the upper part of which is a series of four spines, there 



(ZOOL. CHALL. EXP. — PART LXVII. — 1888:) XsX 141 



